refactor: Remove old decorators and integrate caching into the new cache subsystem
- Deleted the `renamer.decorators` package, including `caching.py` and `__init__.py`, to streamline the codebase. - Updated tests to reflect changes in import paths for caching decorators. - Added a comprehensive changelog to document major refactoring efforts and future plans. - Introduced an engineering guide detailing architecture, core components, and development setup.
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